python模板渲染配置文件
def create_pxe_config(config):#读取配置文件中的配置项
system_common = config['system common']
manage_prefix = system_common['manage_prefix']
manage_gateway = system_common['manage_gateway']
manage_mask = int2mask(manage_prefix)
manage_net = get_manage_net(manage_gateway,manage_prefix)
dns = system_common['dns']
fqdn = system_common['fqdn']
repo_url = system_common['repo_url']
password = system_common['password']
manage_nic = system_common['manage_nic']
storage_nic = system_common['storage_nic']
public_nic = system_common['public_nic']
data_nic = system_common['data_nic']
deploy_node = config['deploy node']
deploy_node_ip = deploy_node['ip']
deploy_node_hostname = deploy_node['hostname']
dhcp_range_start = deploy_node['dhcp_range_start']
dhcp_range_end = deploy_node['dhcp_range_end']
compute_node = config['compute node']
dhcp_template = Template( # 创建一个Template对象
filename='./pxe_template/dhcpd.conf',
module_directory='/tmp/mako_modules' # 为了提高性能，从文件加载的 Template 还可以在文件系统中将生成的模块缓存为一般的Python模块文件，
) # 下次同样参数的Template 创建时，自动重用/tmp/mako_modules/目录下的模块文件。
dhcp_content = dhcp_template.render( # 传给 Template 的文本参数被编译为一个Python模块。模块包含一个 render_body() 函数，它产生模板的输出。
manage_gateway = manage_gateway, # 调用render() 方法时，Mako建立了一个模板的运行环境，并调用 render_body() 函数，把输出保存到缓冲，返回它的字符串内容
dns = dns,
manage_mask = manage_mask,
fqdn = fqdn,
deploy_node_ip = deploy_node_ip,
manage_net = manage_net,
dhcp_range_start = dhcp_range_start,
dhcp_range_end = dhcp_range_end
)
fp = open('./pxe_config/dhcpd.conf','w') # 生成dhcpd.conf配置文件
fp.write(dhcp_content)
if fp != None:
fp.close()
ip_mac_template = Template( # ip-mac 绑定
filename='./pxe_template/ip_mac.conf',
module_directory='/tmp/mako_modules'
)
for compute in compute_node:
ip_mac_content = ip_mac_template.render(
compute_hostname = compute['hostname'],
manage_mac = compute['manage_mac'],
manage_ip = compute['manage_ip']
)
fp = open('./pxe_config/dhcpd.conf','a') # 以append方式打开文件
fp.write('\n'+ip_mac_content) # 追加内容
env = Environment(
loader = FileSystemLoader('./pxe_template') # 这个类的实例被用于存储配置信息, 全局对象, 从文件系统或其他位置加载模板，使用的加载器loader是FileSystemLoader类型,
) # 可以加载的模板是当前工作目录下的templates目录下的模板文件
ks_template = env.get_template("puppet.cfg") # 使用env的模板环境加载名为puppet.cfg的模板文件.
ks_content = ks_template.render( # 渲染模板template
repo_url = repo_url,
password = password,
deploy_node_hostname = deploy_node_hostname,
fqdn = fqdn,
deploy_node_ip = deploy_node_ip,
public_nic = public_nic,
storage_nic = storage_nic,
data_nic = data_nic,
manage_gateway = manage_gateway,
manage_mask = manage_mask
)
fp = file('./pxe_config/puppet.cfg','w')
fp.write(ks_content)
if fp != None:
fp.close()
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